How do I get a robot avatar for the forums?

It seems like most people on these forums have robots for their avatars, all in the same art style. I'm just curious, where do those come from?

I think it's the default (randomized) avatar from gravatar. I don't remember actually making one!

A lot of people didn't make a wordpress account to get their own avatar - so it's a random (robot) one.

I had problems to link my gravatar.com account and had to create a second account to fix it.

Oh, okay. Thanks!

(There's that solved)